Looper mechanism for sewing-machines.



D. S. SEYMOUR.

` LOOPER MECHANISM FDR SEWING MACHINES.

APPLIcAnoN man Nov.4.1911.

II. s. SEYMOUR.

LOOPER MECHANISM FOR SEWING MACHINES. APPLICATION FILED Nov.4. I9II.

1 ,200,659. Patented Oct. 10, 1916.

3 SHEETS-SHEET 2- @mwah www@ I A fiez/6W?? APPLICATION FILED NOV.4, 1911.

Patented Oct.. 10, 1916.

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NVENTOR 5,5'

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DUDLEY S. SEYMOUR, OF OAK PARK, ILLINOIS, ASSIGN OR T0 UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

LOOPER MECHANI-SM FOR SEWING-MACHINES.

Speeication of Letters Patent.

Application 'led November 4, 1911. Serial No. 658,555.

To all whom it may concern Be it known that l, DUDLEY S. SEYMOUR, a citizen of the United States, residing at Oak Park, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Looper'Mechanism for Sewing-h/Iachines, of which the following is a description, reference being had to the accompanying drawing, and to the letters and figures of reference marked thereon.

The invention relates to new and useful improvements in sewing machines, and more especially to the mechanism for moving the looper into and out of the needle loop and laterally, to give thereto the needle avoiding movement.

An object of the invention is to provide a looper mechanism wherein the looper may be operated through suitable devices from a rotary shaft on the overhanging arm of the machine, which devices are so arranged as to give to the looper a proper dwell at the end of its stroke.

A further object of the invention is to provide an arrangement of device of the above character, whereby a looper mounted in the end of a cylindrical bed plate may be given the proper motion, so as to coperate with the needle.

These and other objects will in part be obvious, and will in part be hereinafter more fully described.

In the drawings which show by way or illustration one embodiment of the invention: Figure 1 is a vertical sectional view taken longitudinally of the machine; Fig. 2 is a horizontal sectional view at a point above the bed plate, the movable parts of the bed plate being omitted and the feeding mechanism being omitted for the sake of clearness. Fig. 3 is a detail perspective view of the mechanism for operating the looper.

The Vmachine towhich my inventionis applied, is herein shownas a cylindrical bed machine, and' consists of a main standard 1 on which projects an overhanging arm 2, and a cylindrical bed plate 3. Mounted in suitable bearings in the overhanging arm 2, is a main driving shaft 4, which may be rotated in any suitable way. At the end of the overhanging arm is a needle bar 5, which is reciprocated by the main shaft 4, through a connecting link '6. Said needleV bar'` as herei'nl shown,-v is 'provided .with a.l plurality of needles 7. The upper thread controlling mechanism shown in the drawings, forms no part of the present invention, but is shown, described, and claimed in my copending application` Serial No. 658,553 filed of even date herewith, and it will not be necessary therefore, to describe this mechanism at the present time. The needles which are four in number, are arranged in pairs, two of which are slightly in rear of the others. Cooperating with the rear pair of needles, is a looper 8, while the looper 9 cooperates with the front pair of needles. These loopers are mounted on a looper carrier 10, which is pivoted at 11 to the end of a shaft 12, which is mounted n-ear its front end in a bearing 13.

Mounted on the driving shaft 1, is an eccentric 15. A connecting rod 16 coperates with the eccentric 15. A cross shaft 17 is mounted insuitable bearings in the standard. This cross shaft lies in a plane cutting the aXis of the main shaft at right angles. A pair of spaced arms 18 are rigidly attached to the shaft 17. The eccentric strap 16 is connected with one of the arms 18 by a ball stud so that as the main shaft 4 rotates, the cross-shaft 17 will be oscillated in its bearings. An arm 19 projects downwardly from the sleeve carrying the arms'18,

vand will be oscillated withthe shaft 17. A

link 20 has a ball stud connection with the arm 19 at one end, and with the arm on the end of the feed shaft at its other end and therefore, oscillations of the arm 19 will be communicated through the link to the feed shaft. This feeding mechanism however, forms no part of the present invention, and the purpose of this shaft will not be further described. Also mounted in the standard is a second cross shaft 21 which is parallel to the shaft 17. This shaft 21 carries an adjustable collar 22 which 'extends generally in an upward direction from the shaft, and is provided with spaced arms 23. A link 24 is'pivoted at one end between the arms 23, and at its other end between the arms 18. An larm 25 isrigidly connected with the shaft 21, Vand projects generally in a downward direction therefrom and vis also adjustable'thereon. A link 26 is connected to the arm 25through aball stud at one end, and the other end ofthe link 26 is connected tothe looper carrier 10. As the shaft 17 oscillates, thev shaft '21 will be oscillated Patented oct. 1o, 1916.

through the link 24, and the arm 25 moving with the shaft 21, will, through the link 26, move the loopers into and out of the needle loops. This arm 23 and the arm 25 form, together with the shaft 2l, a rocking frame, which extends above and'below the axis of the shaft and serves to impart the differential movement derived through the connected arms 18 and link 24 to the looper.

A second eccentric 27 is mounted on the main shaft 4L, andan eccentric strap 28 is connected to an arm .28a on the shaft 29, which controls one of the feed movements.

ln the operation of my device, the arms 18, and the link 24e, move from the position shown in Fig. l, where said parts are at an angle to each other, to the position shown in Fig. 3, where said parts are substantially in a line. This mechanism therefore, operates in a sense as a toggle mechanism, and will give to the looper an extended dwell, while these parts are in a line. As a matter of fact, said parts may be moved slightly above alinement, and thereby the dwell given to the looper extended. These` parts are in line when the looper is at the forward end of its stroke, and while the same is being moved laterally for the needle avoiding movement.

Willen the looper moves forward into the needle loop, the needles are of course, rising in the material, and have thrown out the needle loop for the entrance of the looper. This needle loop remains on the blade of the looper until the needles have risen to the top of their stroke, and the feed has operated to move the material and said needles have again returned through the material, so that the points of the needles pass between the looper thread and the blade of the looper, after which the loopers are retracted to shed the needle loop thereon, to allow the stitch to be drawn up. It is essential therefore, that when the looper reaches the forward end of its stroke, that an extended dwell be given to the same to allow suflicient time for the needles to move well above the material, and the feed to take place.

By the above construction wherein the link and arm for operating the looper move into alinement when the looper is at the forward end of its stroke, I am able to secure this extended dwell in the stroke thereof. The looper shaft 12 is oscillated to give the loopers a needle avoiding movement by an eccentric 30, which is mounted on the shaft 29 which shaft .29 is oscillated from the main shaft by devices above described. An eccentric strap V31 coperates with the eccentric and is connected at its outer end to an -arm 32, mounted on the looper supporting shaft l2. This shaft 29 is so timed as to oscillate the eccentric and give to the looper shaft a movement to shift the looper laterally when the same is at a dwell at the forward end of its stroke, and also to shift the looper back to normal position when it is substantially at the rear end of its stroke, and said loo-per held against movement while the looper is moving into the needle loop and being retracted therefrom.

By this construction and arrangement of parts, it will be seen that the looper-operating mechanism includes a. toggle which passes they center twice and gives to the looper an extended dwell at the forward end of its stroke; that is, while the needles are substantially moving above the work, and while the looper is moving over laterally in substantially a right line to position it relative to the needles for its backward stroke.

Furthermore, the mechanism for giving the lateral movement to the looper is such that, as alcove stated, the looper moves over at the forward end of its stroke in substantially a right line, and moves back and forth in substantially a straight line, the lateral movement to enable the looper to begin its forward loop-taking movement substantially occurring at the rear end of such stroke.

It is obvious that minor changes in the details of construction and arrangement of parts may he made, without departing from the spirit of my invention, as set forth in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

l. A sewing machine including in combination a` standard having an overhanging arm, a rotary shaft mounted in said overhanging arm. a cross-shaft mounted in said standard and extending in a direction at right angles to a vertical plane containing the main shaft, means for oscillating said cross-shaft from said main shaft, a second cross-shaft mounted in' said standard and connected to the looper for giving one of the movements to said looper, means for imparting a differential movement from the first cross-shaft to the second cross-shaft, and means for oscillating said looper laterally including a shaft connected to the looper, a slotted arm attached to said shaft, an operating shaft and eccentric thereon, and a strap cooperating with said eccentric and adjustably connected with said slotted arm.

2. A sewing machine including in combination, a standard having an overhanging arm, a rotary shaft mounted in said overhanging arm. a crossshaft mounted in said standard and extending in a direction at right angles to a vertical plane containing the main shaft, means for oscillating said cross-shaft from said main shaft, a second cross-shaft mounted in said standard, toggle means for giving the looper a differential movement from the first cross-shaft to the second cross shaft, an arm adjustably carried by said second cross-shaft, means for connecting said shaft to said looper for moving the same into and out of the needle loop and means for oscillating the looper laterally including a shaft connected to the looper, a slotted arm attached to the shaft, an eccentric and a strap connected to the eocentric and adjustably connected to said slotted arm.

3. A sewing machine, including in combination a standard having an overhanging arm, a main shaft mounted in said overhanging arm, a cross-shaft mounted in said standard, an eccentric on the main shaft and devices for oscillating the cross-shaft from said eccentric, a second cross-shaft mounted in said standard and disposed substantially parallel with the first cross-shaft, toggle links for connecting said cross-shafts, whereby the second cross shaft may be oscillated and given a dwell, a looper and devices for connecting said looper to said second crossshaft, whereby said looper is moved into and out of the needle loop and given an extended dwell at the forward end of its stroke, and means for oscillating said looper laterally including a shaft connected to the looper, a slotted arm attached to said shaft, an operating shaft and an eccentric thereon, a strap coperating with said eccentric and connected with said slotted arm.

Ll. A sewing machine including in combination a cylindrical work support, a standard carrying said work support and having an overhanging arm, a main shaft in said overhanging arm,.a cross shaft .in said standard extending ina direction substantially at right angles to a vertical plane containing the main shaft, means for oscillating said cross-shaft from said main shaft, a second cross-shaft, means for giving said second cross-shaft a diferential movement from said first cross-shaft, means connected with said second cross-shaft for moving the looper into and out of the needle loop, a

shaft mounted in said work support and extending into the standard, meansfor oscillating said shaft, an eccentric mounted on the shaft in the cylindrical work support, a second shaft located in said cylindrical work support, an arm carried by said second shaft, an eccentric strap coperating with said eccentric and having an adjustable connection with said arm, and means whereby said second shaft in the cylindrical work support supports and moves said looper laterally.

5. A sewing machine, including in combination a standard, a cylindrical work support carried thereby, an overhanging arm carried by said standard, a main shaft in said overhanging arm, a cross-shaft. in the standard extending in a direction at right angles to a vertical plane containing the main shaft, a second cross shaft in the standard parallel with the first shaft, toggle links for connecting said cross-shafts, means for oscillating said toggle links from said main shaft, a depending arm carried by said second cross-shaft, means for connecting said depending arm with the looper in the work support for oscillating the same, a shaft mounted in said cylindrical work sup- )ort means for oscillating said last namedl shaft, a second sha-ft located in said work support and connected to said looper for moving the same laterally, and a slotted arm carried by said second shaft, an eccentric on the first named shaft in said work support, and an eccentric strap coperating with said eccentric and having an adjustable connection with said slotted arm.

In testimony whereof I affix my signature, in presence of two witnesses.

DUDLEY s. SEYMOUR.

Vitnesses C. MCNEIL, C. L. STURTEVANT.

Copies of this patent may be obtained for ve cents each, by addressing the "Commissioner of Patents. Washington, D. C. 

